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Requests Test failures with pytest 4 (Fix)

Fixed
Spec
Package
Requests
Fixed In
2.27.0
Python
3.7.3
Verdict
Status
Fixed
Safe for prod
No
Risk
Medium
Last verified
2026-02-09
Own content ratio
0.25
#5048 ai tls Updated: 2026-02-13
Issue #5048

The Fix

pip install requests==2.27.0

Based on closed psf/requests issue #5048 · PR/commit linked

Production note: Most teams hit this during upgrades or environment changes. Roll out with a canary and smoke critical endpoints (health, OpenAPI/docs) before 100%.

Jump to Verify Open PR/Commit
@@ -54,7 +54,7 @@ def run_tests(self): 'pytest-xdist', 'PySocks>=1.5.6, !=1.5.7', - 'pytest>=2.8.0' + 'pytest>=3' ]
repro.py
platform linux -- Python 3.7.3, pytest-4.4.0, py-1.8.0, pluggy-0.9.0 ... ERROR collecting tests/test_utils.py .eggs/pluggy-0.9.0-py3.7.egg/pluggy/hooks.py:289: in __call__ return self._hookexec(self, self.get_hookimpls(), kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:68: in _hookexec return self._inner_hookexec(hook, methods, kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:62: in <lambda> firstresult=hook.spec.opts.get("firstresult") if hook.spec else False, .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:238: in pytest_pycollect_makeitem res = list(collector._genfunctions(name, obj)) .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:414: in _genfunctions self.ihook.pytest_generate_tests(metafunc=metafunc) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/hooks.py:289: in __call__ return self._hookexec(self, self.get_hookimpls(), kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:68: in _hookexec return self._inner_hookexec(hook, methods, kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:62: in <lambda> firstresult=hook.spec.opts.get("firstresult") if hook.spec else False, .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:141: in pytest_generate_tests metafunc.parametrize(*marker.args, **marker.kwargs) .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:1006: in parametrize function_definition=self.definition, .eggs/pytest-4.4.0-py3.7.egg/_pytest/mark/structures.py:113: in _for_parametrize if len(param.values) != len(argnames): E TypeError: object of type 'MarkDecorator' has no len()
verify
Re-run the minimal reproduction on your broken version, then apply the fix and re-run.
fix.md
Option A — Upgrade to fixed release\npip install requests==2.27.0\nWhen NOT to use: This fix is not applicable if using pytest versions lower than 4.\n\n

Why This Fix Works in Production

  • Trigger: platform linux -- Python 3.7.3, pytest-4.4.0, py-1.8.0, pluggy-0.9.0
  • Mechanism: Tests fail due to deprecated parameterization in pytest 4
  • Why the fix works: Supports pytest 4 by updating the requirements and modifying test parameterization. (first fixed release: 2.27.0).
Production impact:
  • If left unfixed, the same config can fail only in production (env differences), causing startup failures or partial feature outages.

Why This Breaks in Prod

  • Shows up under Python 3.7.3 in real deployments (not just unit tests).
  • Tests fail due to deprecated parameterization in pytest 4
  • Surfaces as: platform linux -- Python 3.7.3, pytest-4.4.0, py-1.8.0, pluggy-0.9.0

Proof / Evidence

  • GitHub issue: #5048
  • Fix PR: https://github.com/psf/requests/pull/5049
  • First fixed release: 2.27.0
  • Reproduced locally: No (not executed)
  • Last verified: 2026-02-09
  • Confidence: 0.85
  • Did this fix it?: Yes (upstream fix exists)
  • Own content ratio: 0.25

Discussion

High-signal excerpts from the issue thread (symptoms, repros, edge-cases).

Jump to Sources Open on GitHub
“I suppose https://github.com/kennethreitz/requests/blob/9742da7f91f595796a412a8150aacc00191be039/tests/test_utils.py#L36 Will try to craft a PR.”
@hroncok · 2019-04-08 · source

Failure Signature (Search String)

  • platform linux -- Python 3.7.3, pytest-4.4.0, py-1.8.0, pluggy-0.9.0

Error Message

Stack trace
error.txt
Error Message ------------- platform linux -- Python 3.7.3, pytest-4.4.0, py-1.8.0, pluggy-0.9.0 ... ERROR collecting tests/test_utils.py .eggs/pluggy-0.9.0-py3.7.egg/pluggy/hooks.py:289: in __call__ return self._hookexec(self, self.get_hookimpls(), kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:68: in _hookexec return self._inner_hookexec(hook, methods, kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:62: in <lambda> firstresult=hook.spec.opts.get("firstresult") if hook.spec else False, .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:238: in pytest_pycollect_makeitem res = list(collector._genfunctions(name, obj)) .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:414: in _genfunctions self.ihook.pytest_generate_tests(metafunc=metafunc) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/hooks.py:289: in __call__ return self._hookexec(self, self.get_hookimpls(), kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:68: in _hookexec return self._inner_hookexec(hook, methods, kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:62: in <lambda> firstresult=hook.spec.opts.get("firstresult") if hook.spec else False, .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:141: in pytest_generate_tests metafunc.parametrize(*marker.args, **marker.kwargs) .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:1006: in parametrize function_definition=self.definition, .eggs/pytest-4.4.0-py3.7.egg ... (truncated) ...

Minimal Reproduction

repro.py
platform linux -- Python 3.7.3, pytest-4.4.0, py-1.8.0, pluggy-0.9.0 ... ERROR collecting tests/test_utils.py .eggs/pluggy-0.9.0-py3.7.egg/pluggy/hooks.py:289: in __call__ return self._hookexec(self, self.get_hookimpls(), kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:68: in _hookexec return self._inner_hookexec(hook, methods, kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:62: in <lambda> firstresult=hook.spec.opts.get("firstresult") if hook.spec else False, .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:238: in pytest_pycollect_makeitem res = list(collector._genfunctions(name, obj)) .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:414: in _genfunctions self.ihook.pytest_generate_tests(metafunc=metafunc) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/hooks.py:289: in __call__ return self._hookexec(self, self.get_hookimpls(), kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:68: in _hookexec return self._inner_hookexec(hook, methods, kwargs) .eggs/pluggy-0.9.0-py3.7.egg/pluggy/manager.py:62: in <lambda> firstresult=hook.spec.opts.get("firstresult") if hook.spec else False, .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:141: in pytest_generate_tests metafunc.parametrize(*marker.args, **marker.kwargs) .eggs/pytest-4.4.0-py3.7.egg/_pytest/python.py:1006: in parametrize function_definition=self.definition, .eggs/pytest-4.4.0-py3.7.egg/_pytest/mark/structures.py:113: in _for_parametrize if len(param.values) != len(argnames): E TypeError: object of type 'MarkDecorator' has no len()

Environment

  • Python: 3.7.3

What Broke

Tests fail to collect, preventing any successful test execution.

Why It Broke

Tests fail due to deprecated parameterization in pytest 4

Fix Options (Details)

Option A — Upgrade to fixed release Safe default (recommended)

pip install requests==2.27.0

When NOT to use: This fix is not applicable if using pytest versions lower than 4.

Use when you can deploy the upstream fix. It is usually lower-risk than long-lived workarounds.

Fix reference: https://github.com/psf/requests/pull/5049

First fixed release: 2.27.0

Last verified: 2026-02-09. Validate in your environment.

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When NOT to Use This Fix

  • This fix is not applicable if using pytest versions lower than 4.

Verify Fix

verify
Re-run the minimal reproduction on your broken version, then apply the fix and re-run.

Did This Fix Work in Your Case?

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Prevention

  • Add a TLS smoke test that performs a real handshake in CI (include CA bundle validation and hostname checks).
  • Alert on handshake failures by error string and endpoint to catch cert/CA changes quickly.

Version Compatibility Table

VersionStatus
2.27.0 Fixed

Related Issues

No related fixes found.

Cluster: requests:configuration-error Requests hub Requests best practices All hubs All clusters
Related clusters: Data consistency SSL handshake Other

Sources

We don’t republish the full GitHub discussion text. Use the links above for context.

Source & Disclaimer: Analysis derived from GitHub Issue #5048. Not affiliated with the library maintainers. Verify before production use.